This Khmer-Thai joint border-market got loads of stuff. It's a bit infamous among Thais believing many of the clothes comes from soldiers who died in the war or similar. I would take any such claims with a grain of salt.
I bought a few military style pants here back in 2006, and I still use the very same pants today 2014, so there's good quality to be found. Beware of pickpockets, I'm not sure of their policy now, but when I used to live in the area in 2007 pickpocketing kids had their heads shaved. So if any kids with shaved heads come up too close be a bit on your guard regarding wallet and passport etc.